The picture is a snapshot of the Tsunami Wave Height Model, and it clearly shows the travel of the wave across the Pacific Basin. The USA’s West Coast is on the right side of this shot, from the Center for Tsunami Research at the NOAA Pacific Marine Environmental Laboratory.
The wave decreases in height as it travels across the deep Pacific but grows taller as it nears coastal areas. In general, as the energy of the wave decreases with distance, the near shore heights also decrease.
Wanna know more?
Tsunami Fact Sheet: http://www.noaa.gov/factsheets/new%20version/tsunamis.pdf
Tsunami information portal: http://www.noaawatch.gov/themes/tsunami.php